Portable air compressor



FIG. 1 is a perspective view of a portable air compressor showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

It being understood that the broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portable air compressor, as shown and described. 